Which Groupset?

campag freehub body and cassette ?

The brand new ten speed stuff is same price as 11 speed stuff though.

Would be pretty straightforward with my fulcrums I suppose.

Best price for 6870 Di2 sans cranks?

Ribble

I've never quite understood that road bike brake stuff either, DHers go at mental speeds down ridiculous gradients and need to stop a much heavier bike for much sharper turns, although to do that on the alpine stuff you would almost certainly use sintered pads and fuck off massive rotors.

This is interesting, but we could do with some figures - how fast is "mental fast"?

Road bikes if going into hairpins would be braking from 60-100kph (depending on length and gradient of straight ahead of the corner) down to 10-30kph, quickly back up to "quite fast" and then dumping a load of speed (read: heat) ahead of the next corner.

An advantage for road bikes (assumption!) is that the wind rushing over the rotor and caliper body would suck a lot of the heat out, but the road rotors are significantly smaller than the MTB ones.

That's odd as well to be honest, when you consider the size of brakes that a sealed surface race car runs in comparison to a rally car - the tarmac-focussed vehicle will have rotors that dwarf those on the gravel vehicle.

I would imagine that rally cars are probably limited to smaller brakes due to clearances?
Do rally drivers not use engine braking more too?

Maybe road bikes should have coaster brakes then

Anywhere got black 105 10 speed double in stock and at £300ish? Everywhere seems to be sold out.

I would imagine that rally cars are probably limited to smaller brakes due to clearances?
Do rally drivers not use engine braking more too?

They fit rally cars with bigger brakes for tarmac stages - not so much that the speeds are higher, but with massively more grip you can leave the braking a lot later, generating hugely more heat.

The heat generated is the same when you brake from any deceleration regardless of the time taken to slow. However in practice heat builds up in the materials affecting braking performance.

I expect the challenge with road bike discs is duration of braking.

So this has become another disc brake thread? #discsaredeath

When the braking happens doesn't matter. The deceleration is larger, that's the crucial difference.

Rally cars scrub off a lot of speed by going sideways, too. From my casual observations the brakes are there just to get the car sideways.

@tonyme would be a good person to shine some light on this.

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Ribble 10% off Shimano SHIM10

Anywhere got black 105 10 speed double in stock and at £300ish? Everywhere seems to be sold out.

Same problem here - I've got a nice frame and some lovely 10 speed wheels waiting to be garnished with something like 105 or ultegra

Not for groupsets. Fucking annoying.

Can't swap to a Campag freehub and go that route?

Can't please anyone around here..

Shimano neutral service pulling a Campag/Continental sponsored rider out of the bushes. Like some sort of happy hippy hallucination or something.

http://youtu.be/TGEwyvtPDxY

I used the equivalent code at CRC (SHIM for 10% off) and just bought the items individually. Ended up getting full 5700 groupset (excluding hubs) for £290ish I think, incredible value... had to get a few bits from Wiggle/Ribble if out of stock.

I was just about to ask if the lower traction that rally cars normally have was the explanation - you can only brake as hard as not skidding permits.

Hello.
Just thought I would pop back and say thank you for the disc recommendations. Moved my front to jagwire compressionless and hy/rd and they are after a short 100 miles or so pretty fabulous. Time will tell how they cope with pad wear but really, really pleased so far. I know that they are not the cleanest solution but bang for buck they are really really good. Got another on order for the back now but predictably nobody has stock...

Thank you again

They get up to about 50-70 kph and there is probably a lot more fast-slow-fast-slow bits on a run, I would guess runs are shorter though and top speeds not as high, but on an MTB you get to go sideways and over fuck off jumps which is obviously cooler.

I'm sure it's cool to other MTBers, I just can't get over the pyjamas they wear.

I feel the same about Lycra.

I'm with Snotty and BN on this.

meh.